Improvement in dies for forging harrow-teeth



JOHN PEDDER & GEORGE ABEL. Improvement in Dies for Forging No. 124,6'i9.

Harr w-Teeth Patented Marc h 12, 1872.

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JOHN PEDDER AND GEORGE ABEL, OF WVEST PITTSBURG, PENNSYLVANIA.

IMPROVEMENT lN DlES FOR FORGING HARROW-TEETH.

Specification forming part of Letters Patent No. 124,619, dated March 12, 1872.

Senorrrcarron. To all whom it may concern:

Be it known that we, J OHN PEDDER and GEORGE ABEL, of West Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Dies for Forming Pointed Blanks; and we do hereby declare the following to be a full, clear, and exact description thereof,

reference beiu g had to the accompanying draw-- ing making a part of this specification, in which- Figure 1 is a side elevation of our machine. Fig. 2 is a top or end View (enlarged) of the swaging-dies of Fig. 1. Fig. 3 shows in perspective the form of die suitable for pointing round iron by swagin Fig. 4 shows in perspective one of a pair of dies, having a series of faces to be used successively in the work of pointin Fig. 5 is an enlarged end view through a: m, Fig. 1, of the reciprocating dies; and Figs. 6 and 7 illustrate the product of the machine.

Like letters of reference indicate like parts Our invention relates to the manufacture of doublepointed metallic blanks by means of double-beveled dies, the same being so constructed and operated that they shall be simultaneously operative in forming two points atthe same time. 7

To enable others skilled in the art to make and use our invention, we will proceed to describe its construction and mode of operation.

In any suitable frame-Work, a, we arrange the horizontally-moving rain (I, and guide it in its motion back and forth by slides a 0, working in grooveslof the posts of the frame a. In the end of the ram cl is a double-beveled die, g, having two operative faces, which recede backward from the middle vertical line, as more fully showniirrl i gs. 2, 3, and 4. This die is fastened to the endof the ram by a dovetail joint, but may be secured by clamps or in other convenient way.

A reciprocating motion is imparted to the ram d by means of the armf, or in other suit- ,opposite to each other. chine to the same end we fit up the dies g h able way, thereby causing the die 9 to operate against the counter-die k, which is simi- J lar in shape, having two faces receding backward from a vertical line at or near its middle part.

The die-h is secured to the stationary block 1 but may be mounted on a ram, like the ram 01, and so arranged as to operate simultaneously therewith, so that the two dies shall come together at the end of the inner stroke of the rams.

The operation is as follows: A blank or bar of the proper shape for the body of the article to be made is placed between the two double-faced dies g h, and the ram, being operated by theleverf, forces the die 9 forward against the blank, thus making double 'bevels on two of its opposite sides. The ram is then drawn back, and the blank is turned onequarter way around, so as to bring its other two sides between the dies at the next forward stroke of the ram. This operation is repeated until the blank is swaged to the form shown in Fig. 6, which shows two pointed blanks joined at the pointends by a slight pin of metal.

These dies are more particularly applicable to making barrow-teeth, though also useful for other purposes. Such dies may each have but a single pair of double faces; or, if so preferred, they may have, either or both, a series of faces of different heights, suitably formed for compressing the iron at successive stages of the operation, as illustrated in Fig. 4.

The double conical taper shown in Fig. 7 has heretofore been made by a pair of reciprocating dies, 0 b, the converging faces of which (or one of them) work lengthwise and To adapt our mawith a groove, m, in each face of a conical form, decreasing in size or tapering toward the middie of the die, as shown in Fig. 3. The operation in such case is substantially that first described.

We do not confine ourselves to'the exact angle of bevel shown in the dies, but vary this to suit the article to be produced. Dies also made as described, and with like operation, may be arranged in hammers, presses, and rolls, so as to produce the same efiect.

What we claim as our invention, and desire to secure by Letters Patent, is-

A pair of double-beveled dies suitably arranged so as, by successive impacts on the opposite sides of the rod, bar, or blank placed and rotated between them, to form the poly ona-l 0r conical points of two blanks at the one operation,substantially as described.

In testimony whereof we, the said JOHN PEDDER and GEORGE ABEL, have hereunto set our hands.

JOHN PEDDER. GEO. ABEL.

Witnesses:

W. N. PAX'ION, Gr. H. OHRIsTY. 

